ange-ftp-insert-directory fights with ange-ftp-file-symlink-p

[David Casperson <casper@unbc.ca>]

In GNU Emacs 21.3.1 (sparc-sun-solaris2.8, X toolkit)
 of 2003-05-25 on csfac007.unbc.ca
configured using `configure  --prefix=/ld1/local'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: en_US.ISO8859-1
  value of $LC_CTYPE: en_US.ISO8859-1
  value of $LC_MESSAGES: C
  value of $LC_MONETARY: en_US.ISO8859-1
  value of $LC_NUMERIC: en_US.ISO8859-1
  value of $LC_TIME: en_US.ISO8859-1
  value of $LANG: en_US.ISO8859-1
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

ange-ftp fails when you run find-file on an ange-ftp symlink to a
directory, where the symlink (on the remote machine) resolves to an
absolute path name.  The problem occurs because both
ange-ftp-insert-directory and ange-ftp-file-symlink-p call
ange-ftp-replace-name-component, resulting in two copies of the /...:
part of the file-name.

The following patch seems to cure some of the problems.

*** /tmp/ange-ftp.el	Tue Dec  7 13:18:09 2004  xxx fixed version
--- .../21.3/lisp/net/ange-ftp.el	Tue Oct 22 01:14:33 2002
***************
*** 4340,4360 ****
  	  tem)
        (if parsed
  	  (if (and (not wildcard)
  		   (setq tem (file-symlink-p (directory-file-name file))))
  	      (ange-ftp-insert-directory
! 	       (if (not (ange-ftp-ftp-name tem))
!                    (ange-ftp-replace-name-component file tem)
!                  tem)
  	       switches wildcard full)
  	    (insert
  	     (if wildcard
  		 (let ((default-directory (file-name-directory file)))
  		   (ange-ftp-ls (file-name-nondirectory file)
  				switches nil nil t))
  	       (ange-ftp-ls file switches full))))
!         (ange-ftp-real-insert-directory file switches wildcard full)))))

  (defun ange-ftp-dired-uncache (dir)
    (if (ange-ftp-ftp-name (expand-file-name dir))
        (setq ange-ftp-ls-cache-file nil)))

--- 4340,4358 ----
  	  tem)
        (if parsed
  	  (if (and (not wildcard)
  		   (setq tem (file-symlink-p (directory-file-name file))))
  	      (ange-ftp-insert-directory
! 	       (ange-ftp-replace-name-component file tem)
  	       switches wildcard full)
  	    (insert
  	     (if wildcard
  		 (let ((default-directory (file-name-directory file)))
  		   (ange-ftp-ls (file-name-nondirectory file)
  				switches nil nil t))
  	       (ange-ftp-ls file switches full))))
! 	       (ange-ftp-real-insert-directory file switches wildcard full)))))

  (defun ange-ftp-dired-uncache (dir)
    (if (ange-ftp-ftp-name (expand-file-name dir))
        (setq ange-ftp-ls-cache-file nil)))

I have only tested this for a few cases using unix-to-unix ftp.  I do
not understand the ange-ftp code well enough to know whether some of the
other uses of ange-ftp-replace-name-component may cause the same
bug.  At least some of them seemed provably harmless.

David
-- 
Dr. David Casperson                          |  casper@unbc.ca
Computer Science                             |  x6672    Fax.5544